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TPS650830: VTT(LDO1) voltage at startup

Part Number: TPS650830

Hi,

My customer is using TPS650830.
and he has a issue at startup.
Please see the red circle of the following picture.
This is LDO1 valtage waveform at EVM.
The Voltage jumps at startup.
Could you let me know the reason of this behavior, please?
and could you give me advice for preventing this behavior, please?

Best regards,
Shimizu